One of the things I've learned from this current round of revising Twinned Universes is to make the most of my antagonists. In previous drafts, they've been like spiders waiting for my protagonist to wander into their webs. Now I've made them more active in pursuing their goals, and I've given them more POV time as well. Unfortunately, I can't go into detail without giving away spoilers.
As readers, do you prefer to stick with the main character's POV, or do you enjoy getting other points of view too? Does it matter which side the character is on?